How long has it been happening?
Just curious if you’ve tried some of the basic refresh browser tab, reboot computer type things?
For debug, maybe try File > Make a copy, launch Tiller Money Feeds from the copy, link accounts, and fill.
Same issue?
If so, in the copy, remove the columns you recently added, and fill - same issue?
If that fixes it, in the copy, add back columns until fill breaks, trying to narrow it down.
The Type column made me think of this older issue where naming the column Category Type fixed it (assuming the column is the Category Type and not Account Type). This was with Manual Transactions and not filling data, so it might not be related to your issue, but just wanted you to be aware of it.