[Endoperez]

First, The Scale Bug (TSB) also appears after restarting Dominions and creating a new game. It isn't restricted to only appearing after creating/playing multiple games in one sitting. TSB brings your scales down, and they usually stay down until the bug disappears.

Second, TSB disappears after all neighbouring provinces are under your dominion. After that point, your scales will increase the normal way, which can be slow. However, scales can go down if you ended the turn without your dominion in all neighbouring provinces. If you open your turn, see that scales went down, and have dominion in all neighbours, it's probably due to dominion spreading to the last province that turn.

Temperature varies with seasons. A province can go from neutral to Heat 3 in one turn (but that only happened once in my tests), so even your capital's temperature may vary. I don't if friendly dominion weakens the effect of seasons, but my tests were often made with rather low dominion in the capital. If Cold scale disappears in early game, it may be due to random chance. If Heat scale disappears, it's probably due to TSB.

TSB can affect Growth and Luck. I think the scale drain happens in order, so first you lose your Order, Then Production, etc etc. When I had just Growth, Luck and Magic, I first lost some Growth, then all; then some Luck.

I think dominion can increase the scales even when the capital is still affected by TSB. However, the chance of increase isn't that good, so it might take several (4-5 wasn't rare) turns after TSB is negated before you're back to full scales.