I have a Boltek PCI with NexStorm running and I've noticed this both times when a storm cell gets close.
When several storm cells are being tracked and if one of those cells enter the close circle (the black hole), the other storm cells are drawn into the closest storm cell very quickly. No matter which direction they were originally heading, they all pile up on the close cell and they don't move from there. All other strikes are then marked in the piled clump so all you see is a close storm cell with all of the strike symbols in the center. The strike rate and noise rate starts jumping from there. I re-started the computer and it still logged everything the same way. Un-plugging the antenna and then re-starting straightens it out.
I'm not sure if it's harware or software. Any ideas?
Curly