My best guess is that it has to do with some technical analysis that causes whales to start buying and this is causing some chain reaction, however this is just a guess.. Would love to hear your opinions.
The fact that they have a very low volume causes that. When there is no volume and the liquidity is very low, buying $10 worth could mean 2x for many very tiny coins, I have seen that with a token that I was in charge of, the volume was $300 a day and half of that was fake volume, so whenever someone bought $100 worth of tokens the price actually went up quite a lot, at the time bitcoin was around 6-7k dollars and one day someone spent 8 bitcoins to buy EVERY coin available, the price went from being $0.000001 or something, to being $100+ because there was no token sold aside from those hugely insane numbers.
Of course that changed in 5 minutes and people started to sell like crazy when they saw that price, but just one crazy person was enough to turn something nearly zero to over hundred bucks all by himself. This is how all those coins go up like crazy, lack of volume and liquidity.