Virgin kegger, beer intween "out" line and tap..

[nvs-brew]

Hey guys, as stated I just legged for 1st time tonight, all went well.. BUT once I pressurised the kegs and then I connected the "out" line after, a little beer went into the line..
Is this normal?
Was it because I connected the "out" line after?

 

[nvs-brew]

1st time kegger stress out hahahaha

 

[nvs-brew]

All good guys, got the answer I wanted to here..

Phewww

Now to clean up all my mess hahaha