hello; may I assume you are saying all the eggs turn white?? If so the male is not willing, competent or able to do his part.
I have a breeding pair of angel fish that have produced several batches of eggs. Sometimes the male misses more than he hits.
Another possibility is the male is sterile and is just going thru the motions. I suppose the female can be sterile but that seems much less likely as actual eggs are being produced.
Another far fetched possibility comes to mind. That being both are female and are also just going thru the motions. Maybe much too farfetched.