Thanks for playing and glad you enjoyed!
What you experienced, and I'm sure everyone as well, are some inconsistencies with the stock market on the release build. We didn't have the time unfortunately to address this issue before the deadline, so it is what it is.
The intention was to simply have the shares counters increment by one on each button press immediately and display back to you. And the shares owned value remains throughout the whole playthrough. The flaw likely exists either in the reset logic where we forgot to reset a value somewhere. There seems to be another bug where the action to buy/sell shares is wrongly unavailable at the beginning of a level. Appreciate the feedback and the screenshots, and hope to patch once the voting period is over.