sticks hydrogen atoms to all near atoms

I try to simulate solid porous organic cage (CC1) with C, N and H atoms. but when I run nve and then npt and visit the result in VMD,hydrogen atoms on sp2 carbons stick to all near atoms.

Is problem from input (potential parameters) or from VMD or from initial molecule?

If my input is incorrect, can you help me to correct that? (10.7 KB)