Fulltext link doesn't always point to the right location

Fulltext works https://ubffm.hds.hebis.de/Record/HEB232920281 -> https://www-munzinger-de.proxy.ub.uni-frankfurt.de/search/document?id=00000011074&type=text/html&template=/publikationen/personen/document.jsp&preview=0

APP: Fulltext doesn't work https://mobile.app.uni-frankfurt.de/hebis-detail/HEB232920281 -> https://www-munzinger-de.proxy.ub.uni-frankfurt.de/search/katalog/personen?portalid=50919