I’ve not seen such issues before on MH’s site, so not sure…
Perhaps share a screenshot of the map you are seeing?
Or you can also check AeroLOPA, see which seating chart best matches what MH is showing you? (Including row placement.)
https://www.aerolopa.com/mh
https://www.aerolopa.com/mh-359-1
https://www.aerolopa.com/mh-359-2 (it notes there is currently 1 of these in the MH fleet, discussed here:
A350 new J seating?)