Forum filtering is confusing in some cases

[Kirby]

Affected version

2.2.13

Steps to reproduce

1. Create a forum with Thread list date limit = 7 days
2. Access that (empty) forum
3. Open the filter menu , set Last updated =14 days and click Filter
4. Click on Show older items

Expected Result
Either
a) Filter Last updated: 14 days is removed after step 4) - Preferred
or
b) Link Show older items is not beig displayed after step 3)

Actual Result
The filter is still being displayed on the page and is shown in the URL altough it is not being used and the filter menu shows Last updated = Any time