This is just wrong. What is your source? Line 4 does NOT go via the dead end street of Reddingsweg.

Like it was before, line 4 stops at the stop that is called Knuppeldam for line 5. It's the same stop with different names for different lines, which makes it confusing. 

What you've now mapped as Knuppeldam is both the stop Knuppeldam as well as the stop Reddingsweg/Aisterbun for both lines 4 and 5.

Source: just walked by there + did a 1yr research paper on public transport on the Dutch Wadden Islands.