The reset of the Explore page often happens due to Instagram algorithm changes, technical glitches, or temporary issues from updates. Sometimes, the algorithm "forgets" your established content preferences, leading to a fresh or random mix of posts like nature photos that don't match your typical interests. This can be temporary and might fix itself after using the app for a while or refreshing the Explore page multiple times. Restarting the app, reinstalling it, or checking your internet connection can also help resolve it. Instagram has a feature to reset your suggested content manually, which refreshes the Explore page to better align with your updated preferences.