Prestoshop 1.7 carriers doesn't ad heights

[decazo1]

Prestashop 1.7.5.2 does not ad up heights for combined sales of books for (2+2 cm) letters, so no there's no maximum height of 3 cm

for letters. > 3 cm = Parcel. This worked correct in PrestaShop 1.6!

Limmit for the height is set correct on 3 cm. height of books are set correctly on 2 cm. Letter should be out of range,

but is accepted.

Has anybody a sollution?

Henk