When soldering the controller, the main thing is to place it correctly and evenly so that its legs lie on the contact pads without any distortion.
Then solder two legs diagonally, thereby securing it.
Well wet the liquid flux - do not regret it!
And we hold the soldering iron tip along a row of legs, trying not to press the soldering iron tips on the controller pins.
The solder will melt and, thanks to the flux, will flow under the feet.
If somewhere between the legs there was a drop of tin, then you can remove it with a stripped, multicore copper wire moistened in a flux.