TabSeq Issue

When I create a new record, the first time I try to tab beyond the first row of fields on my form, in this case:

First_Name (tabseq = 1), Middle_Name (tabseq = 2) and Last_Name (tabseq = 3)

The tabseq will jump to the navigation panel to the right!

If I try it again, it will work on all subsequent attempts.

I have checked the order of the tabseq on this form many times.

It is set to go to the company field or 4 in the sequence.

Does anyone know the reason for this?

Thanks!

need to see an example for this.