First of all: thank you for the free account and supporting Linux, even with a desktop app!
The problem I encounter is more of an annoyance, though it shocked me the first time it happened.
I click the start button and the timer becomes visible on the button. I shrink the app and work. When I go back to the app, the visible timer picks up where it had left off before the shrinking. Only when I click STOP and the block of time that was counted gets added to the Today section do I see the whole tracked time.
Example to clarify:
I start timing, the button counts to 0:11, I shrink the app. I work for 30 minutes. I bring the app up. Instead of showing 30:11, the button resumes counting: 0:12, 0:13, 0:14, etc. I click STOP, the tracked time moves into the Today field and shows correctly 30:15.
I’m on Linux Mint, 21.1 cinnamon.