That’s because both guides are using the same tags, no idea when this happened.
Investigating at the moment.
-edit-
Looks like the guide was cloned and file was renamed to 01_50, however, the contents remains the exact same as the 01_30 original guide, no idea what the intent was. @Dugi is this by accident?
Looking further in to Leveling_Gudies.xml, the 01_50 clone is not listed in that .xml file so looks like that file not getting loaded.
None of the above explains why the next guide link is showing the same guide that is loaded, though physically its
48(5-50)#48(5-50)#48(5-50) which is Loch Modan.