Are you using the free version of Lightroom mobile? If yes, the presets are stored locally on the mobile device & re-installing them may have removed the data related to the app. You can try restarting the mobile device to check if that helps.
When you have the free version of Lr running you need to transfrer the data via an iOS backup. E.g first create a backup of all data from your previous phone and then setup your new phone from the before create iOS backup. Hope this helps. - Guido / Lr Mobile QE