Neospector

Storage can take some time to apply, check back later and it should have expanded your slots.

We got one box in the gift notifier.

Storage may take some time to update. Give it a little bit, and check back later.

If you have to censor your words, maybe don't say them in the first place.
Also, it's a helmet plume, they're common on medieval and Greco-Roman helmets.

In any case, you can still obtain the items you want. Or, alternatively, don't advance to 5-star rank, unless you really want the 15-star scroll.

You can purchase the old items in the shop at 1-star, 2-star, 3-star, and 4-star ranks for 300 coins each.

If the issue is resolved by using a rune, then this is intentional behavior.

If you leave a run inactive for too long (about 5 minutes), the rune will trigger a curse that starts to lower the EXP and drop rates of the mobs in the map, depending on how long the rune has been left unactivated (maximum Stage 4, 100% EXP/Drop reduction). It should also display this information at the top of the screen:

Using a rune will remove the curse on the map, and grant you 15 minutes of immunity to the curse.