A. Try restarting the app. Close it completely by swiping it away from the recent apps list, then reopen it. This can help refresh the app's performance.

B. If the problem persists, consider uninstalling and reinstalling the app. This can resolve issues related to corrupted files. Go to 'Settings' > 'Apps' > 'Tumblr' > 'Uninstall', then reinstall it from the Google Play Store.