It looks like it is related to the lazy image loader feature of the jetpack plugin. Can you please update to the latest plugin release (4.18.7)? It was just released, and should hopefully resolve this issue as well.
I actually found the conflicting code, it was a minimum height attribute causing the push-down. Please remove the previous code, and use this one instead:
.probox .proinput input {
min-height: auto !important;
}
It will resolve both the alignment issues, and re-center the input.