Girls, hello! Question: my son's teeth are erupting in such a sequence…

Girls, hello! Question: my son's teeth are erupting in such a sequence: two lower front ones have already come out --> the upper front on the left has come out one, from the right there is none yet. BUT, on the right side, next to the still unerupted front tooth, it has erupted sideways ? Is this normal? First child experience - 0? I hope I wrote it clear ?