How user apps installed from Play Store get update from Get Apps in Xiaomi MIUI 12

I am using Redmi Note 10 Pro with MIUI 12.5.8 Android 11 running on it. The device has two official application providers, one is Google's Play Store and other is Xiaomi Get Apps. My issue is that, I installed whatsapp from Play Store. Now, it shows that whastapp has an update under Settings-System apps updater-Otherapps, on clicking which will load Get Apps. I checked play store, and there's no update showing. Similarly, for Zoom app, update available both from Play Store and Get Apps. How Play Store installed app got an update from Get Apps?