After you use questie for 5-10 different quests, the quest tasks stop showing up in overlay UI. Did a quick glance over the issue posts and didnt see one like it, sorry if dup.

Not sure what UI element you mean, but the quest tracker hasn't been ported to the Classic version yet. So you're most likely seeing the Blizzard quest tracker. Shift + leftclick on a quest in your questlog will add them to the tracker again.

The main feature i waiting for is questie tracker. Any chances i will be ported? Damn that blizz tracker with 5 limit 👎

It is already in development, but since some severe issues came up with the Classic release the release of this feature has been delayed. Sorry about the frustration.

Checkout the latest Questie release. The tracker has been ported!