My comments as to expected performance are confined to official Apple devices only - and should not be interpreted otherwise.
You should be approaching the manufacturer of the third-party device/dongle/power-supply for comment as to performance of their product with your iPad - and for any support needs you may have. We really cannot constructively comment on whether your device(s) is/are defective - or even its fitness for purpose - where non Apple components are involved.
Genuine Apple accessories, or those specifically certified for iPad (carrying the official “Made for iPad” certification label) can be be expected to perform adequately with your iPad. There are some very good reputable t-p manufacturers who produce great accessories and aftermarket devices. However, should you choose to purchase and use “uncertified” devices, you take a chance on compatibility and technical performance.
Some buyers choose to spend a tidy sum on their Apple device - and then choose cheap aftermarket accessories. When something goes awry, they then question why the accessory provides substandard performance - or in extremis, complain of damage to their expensive Apple device.
Is this a risk worth taking? Only you can decide.