I (plat) just had a value tix BKK-HEL-LHR both legs upgraded, LH with a voucher, SH with points. App said that BKK-HEL (voucher upgrade) had 3 bags and HEL-LHR had 4 bags and as I inquired this from the CS they told me it's a bug and they'll fix it directly in my booking. (They never did, but I didn't need it anyway so I didn't inquire further.)