when a potion which is not a final stage(for example awkward potions) is almost finished brewing. if you spam shift click your next brewing ingredient so that it will go into the brewing stand as the first one disappears the item will go in as expected but the potions below will look like they have not been effected by the first ingredient. this corrects only when you take the brewed potion out of the brewing stand and it will turn into the potion that is the combination of the ingredients that were put in.
MC-222804
Brewing stands being different for client and server
Resolved
Invalid
0
This report is invalid as your game was modified when experiencing this issue. In the environment field you've provided, you mentioned you were using modifications and the bug tracker only handles reports that can be reproduced in a vanilla environment. If the problem persists without the use of mods, feel free to create a new report. Additionally, please see the Bug Tracker Guidelines for the minimum standards when submitting a ticket.