When damaged you sometimes get launched into the air

I made a system for when you look upwards it summons lightning, but when I jumped and looked upwards, I was launched 100+ blocks into the air. This happened again when having the Wither effect whilst swimming upwards in water.

Commands:
Wither:
/execute @p ~ ~ ~ detect ~ ~ ~ water 0 /effect @p 20 1 5

Lightning:
/execute @p[rx=-89,rxm=-90] ~ ~ ~ execute @p ~ ~ ~ summon LightningBolt