Coinmarketcap is showing something like an average price of the particular coin from ALL markets where is it traded. Sometimes the exchange prices could be different which makes the average price inaccurate.
What about Helbiz. It probably shows it comparing to the time this coin is listed on CMC. If you open charts you will see that it was only listed somewhere around 5 a.m. I guess this is why the % change could be diffetent from the exchanges.
Exactly. Coinmarketcap just shows the average price of a particular coin. So the price is not reliable per se. Although I frequently check the price on the website, but it doesn't mean that they are very accurate, probably you can get at least an idea on what is the current price, so don't make decisions on what you are seeing in their but go to the trading platform to get a good grasp of the price depending on that exchanges.