And it could also be that some how the coil/wick has become "Burnt", or "Scorched", and you either need to change the coil or clean it.... if possible.
When I used to use Store bought coils/wick in the past, it was always a crap shoot.
Sure... once in a blue moon all five in the pack worked correctly, but that was Rare !
Most times 1 or 2 of the five were built poorly and either flooded, or hit dry. ( Sometimes even a short in the coil.)
If the the wick is not wicking fast enough to keep up with your vape, you will burn the wick and all juice after will taste burnt until cleaned/Replaced.
This is not your fault..... its cheaply mass produced products.... it is what it is.....
Hope you get it worked out !