Hi Myszaks! Can you please send us your save file and unity output_log.txt? Also it would be very helpful if you can describe your problem a little bit more. Did it appear from the beginning of the game or after some time? Do you remember what you did before it appeared? Each piece of information will be useful ;)
You can find save file in: %GameFolder%\DevTycoonAlpha_Data\StreamingAssets\
The second file is in: C:\Users\%UserName%\AppData\LocalLow\DevStudio\DevTycoonAlpha\
Also check if this bug will appear if you start a new game.