what happened with jeptack 

http://worms2d.info/Test_versions

TS also doubles the maximum roping and jetpacking, removes the projectile motion speed limit

This is TS version Faster jetpack.

I mean worms stayed on jetpack and saw their oil and hp?  and then activate in next turn also

TS includes BattyRope, which allows staying on your utility during other players' turn (until you get knocked off from it).