Hello Nkemp1990,
It sounds like you were in the process of migrating all your photos from your PC to iCloud, and the iCloud folder is showing 4870 photos but your iPhone only shows 1575 items.
Please check out the information in: Get help with iCloud Photos
Specifically the section that states:
As long as your iPhone is signed into the same Apple ID as the iCloud account you have uploaded your photos to, "You can see if a photo or video has uploaded to iCloud when you open the Photos app and view your library in Moments. Your upload status is at the bottom of the menu. You can also find photos and videos from your Photos Library that haven't been uploaded to iCloud in a smart album on your Mac."
You may also find the information and steps outlined in the following article helpful:
If your iCloud Photos aren't loading on your PC - Apple Support
We appreciate you reaching out to Apple Support Communities.
Be well!