Variants not imported/ images missing

Hello,
i import hundret items from aliexpress to import list in wordpress. I can see, that every item has variations.
if i click: all import = and many items are imported wihtout any variants and just one image!!!
But where is the mistake here? Every second item is not really imported. But in Import List it was all right!

for example :
Imported: Thunderbolt 3 PD Kabel USB 3,2 Typ CM zu Typ CM 100W 5A/20V Schnelle Lade 4K Mit E-mark chip 10Gbps Gen 2

other one:
USB C Kabel PD 100W 10Gbps USB TYP C 3,1 Gen2 Kabel Für Macbook Pro/Air DELL xiaomi 20V/5A 4K @ 60Hz

On Aliexpress its with many images, but i have only one.