Mouseflow Heatmaps: number of clicks seems too low

Im using Mouseflow to show heatmaps of click behaviour on our site.

I think this is not first account / project where I see that in a specific time range number of clicks that Mouseflow shows is very low compared to real state (there is also Analytics, and real conversions we are receiving).

Does anyone has experience with Mouseflow to clear this? Is Mouseflow missing some clicks?