After Using a potion, I changed my Food and immediately I lost all Potion Effects. Not sure why this is a thing as Only a different Potion changed Potion Effects, it appears it is affected by all consumables. A temporary work around is to relog into the game.  I believe this needs to be looked into.

Hi there, can you be more specific which potions and which food you used? I did not notice this happening today, so it would be best to know if it might be related to specific items.

I was using  A Giants Potion, and Switching from Simple Cron Meal to Equisite Cron meal. Immeditately the Giants Draught effects dropped off. Was in Elvia Realm when it happened. The Icon showing the effect of the potion was intact, but the actual effects were nulled as I changed food mid attack.

I just tried it and it did not happen to me. How many buffs did you have active? Maybe it just was pushed off your visbile buff bar, because there were too many buffs active

I only had Breath Exp +10%, Combat Exp book and Simple Cron active. I added the 1hr Giants, and about 5 minutes later I swapped to Equisite Cron Meal. My Lahn moved at 25% of the speed and the known Cymbidium skill flow broke every time, of which is does regularly even with no buffs running at all and was artificially slowed, but since Swap Nagas do not slow, I am thinking it was the food.  Once I relogged, My attack Speeds were back to normal before I used the new Food. The Icon still showed Active, but after eating the new food, it was if I was playing base attack speeds of a Level 10 character.

There seems to be some other things going on then. Maybe it would be good to send a ticket so your case can be investigated.