I’m in the battle results screen at the end of the match and my Booster expired, when I press ENTER key, I get automatically assigned Boosters, BEFORE I return to the hangar or LAUNCH a new battle directly ASAP.
Diamond Coating (10 Hull resistance Booster) [3 rounds], after my 3rd round, I got LAUNCH and To hangar options.
However, If you press ENTER by NOT selecting ANY of these options , you will just automatically apply the Booster, before it is visibly displayed in the hangar.
I think that slider issue might work the same, if you want to buy more than one Booster. This could be a problem, especially if the Booster is from GS category (paid by money).
Another related issue: If you lose a connection and then re-launch or restart the game, and if you wait a little, before pressing YES to return to battle, you will get a booster notification, while still in battle, because your Booster lowers by 1 or if it’s depleted, it asks for extension period. It will not memorize that you already have such booster active in a current battle.
Logs: (in case you need them)
Screenshot of Problem 1: