If this was intentional, my apologies. I thought this was suspicious because I hadn't noticed it with the other bombs I own. The capacitor line of bombs cancels knockback effect of swords when monsters are caught in the shock cloud. For me, using troika line, this is not so good. On the other hand, my brother(who owns the bombs) uses the calibur line and loves it, since it allows him to double/triple hit with his charge attack.
This is intentional. Capacitor bombs shocks enemies and shock, when activated, will halt whatever anything is doing including getting knocked back.