Fold 6 strange wireless charging behavior (and other Galaxy phones to)

I'm facing a very strange wireless charging behavior:

• when I first put the phone on the charger, it draws about 400mA/h.
• after some seconds it jumps to 1500mA/h.
• then after 10-20 seconds, it stables at 700mA/h.
• normally, it takes 5 hours to fully charge my Fold 6. (The numbers were measure by AccuBattery and Ampere)

This has happened on all my phones: Fold 6, Fold 4, Note 20 Ultra.

I has tried multiple wireless charger, from the official one (EP-P5400) to the certified one (ArcField™ Stand Flex made for Galaxy) to the Xiaomi 20w fast wireless charger. I also tried pairing them with the 25w Samsung wall charger, Xiaomi 65w charger, Macbook 90w charger.

I already enabled Fast wireless charging in Settings.

Does anyone experience the same issue?