There is a choice dialogue entry lost in the journal. You might have deleted a topic in tesame.

latest rumors entry that points to Arrille and adds the quest topic:
- is not stopped when the mine quest has started, or even when it's over
- is enabled when MV_DeadTaxman ends, but no longer obtainable if it's at 130. That only exists as a journal entry in Patch for purists, which is sensible to refer to but something that would better be noted in the comments of that entry; however it doesn't seem like it SHOULD be blocked when the journal is at 130, since that's just a duplicate of a normal entry from the end of MV_DeadTaxman, and not some sort of quest fail state.
- is below the original two Seyda Neen ones, so your mod may be incompatible with any that adds others to Seyda Neen above the originals, and you wouldn't even be able to give priority to it by changing the load order because yours would still always be below them. That's for a mod - in a TR quest, latest rumors would be too unreliable to be the unique starting point, and you'd add a special greeting to the questgiver (if you do something like that in your mod you'd have to make it a one-time greeting since Arrille is such a common NPC).

Some replies still have missing parts or words - "Arrille thanked me for my assistance and bid me a good day give me two potions of restore health"
"it was logical guess as to what was wrong with it."
"Hmph. Suit yourself. I can someone else to take care of it. I think Hrisskar owes me hefty bar tab anyways."
"What about it? I told where it was"
"According to rumors, one of the kwama became infected with blight and it spread all the way to Queen The mine "

kwama mine topic
"Yes, I heard about Arrille is looking for help with opening the mine."
is above the line for finished quest so the latter will never work. it also has no quest conditions itself so will never stop showing if the quest is failed

"To begin, thank you for telling me.. Now, get out of my sight you moronic fetcher. I have to clean up your mess now."
that line never gets used. the journal 70 that it's linked to either? "I have killed the kwama queen at Abaesen-Pulu mine. I will have to report back to Arrille to report the news of its death." That journal never gets triggered by the kwama queen script.

"Now the mine is just past the crossroads that is halfway between here and Vivec, which is east of here. There is a small campfire in front of it. Can't miss it.

Now if you excuse me, I got a business to run."
- I think when I used empty lines in dialogue before I found it to be a problem because they normally separate new replies, so players would at first only see the latest line as new and have to notice they missed something from context

Abaesen-Pulu Egg Mine topic
"The local eggmine? Yes, it went out of business r"
same problem, this will always overwrite the other lines, and so on. Replies have priority from top to bottom, in that topic they're mostly ordered from bottom to top

the Blight as a noun usually capitalised (74 vs 12)
"corpus" is Corprus

"was shutdown"
"comeback"
are in two words

Last journal entries aren't in index order, but that's only a problem for legibility, not for the engine. Same for the choices being ordered haphazardly in the topic, not a problem for the engine but harder to understand in the CS. Since you also have cases of wrong entries overwriting the others due to ordering that's something you have to pay attention to and ordering them more logically would help with that

" I much rather have the septims than the inventory" - I'd
"People around here are not exactly the brightest bunch around here"
"He also noted if I were to kill the queen I would not receive a reward for my efforts as he will have to waste time and money transplanting a new queen to the mine, commenting how they are so delicate to transport, despite how fat they are." - usually better to break up sentences that long, also "commenting how" might not be standard writing vs "commenting on how"
"After reporting back that the kwama queen is dead, Arrille told me I was a baffoon and to get out of his sight." - buffoon

kwamaQueenSeydaNeen script
"The dead script is handled by a global variable for compatiability sake." - a less vague comment would be better when there is a compatibility issue, tho that wasn't what it was here

MW_BAB_MinersReturnScript script
works as intended and won't be as confusing now that there's no extra endif, but it's still better to align each "endif" at the same level as the "if" that it's closing