This might be related to the lag but I notice the game keeps running even when it is paused.
Notice the power, money, and the number of cars in the showroom changing when it is paused
youtu.be/MNO86kScKC8?t=10s
Noticed the same on mine. Not sure if it is related to the performance problems that should be fixed in the upcoming versions. Seems like it stops after a little in my game. Most likely delayed updates to the GUI.
Hi, all fellow production line lovers.
I have been having this bug where even if I pause the game my money fluctuates and decreases.
I think this is a bug I just wanted the developer to know.
Thanks.
As Evilerfungus mentioned the Bug has already been reported…
… Merged Threads together …
Thanks for some help, hopefully, the devs fix the problem in the next update.
Oh dear… I shall investigate 
ok should be fixed in 1.14.
Thanks !!!