Percentage price surcharge on image-hover not adapting to basic product’s price

I am using PPOM Pro and for some products I have product features configurable via the PPOM field of choosing from images.

In some of these image-fields I have price surcharges which are set via a percentage-value (in my case ‘15%’).

Now when a product is configured to show the PPOM-images the initial price is calculated correctly and shown on each image by hovering (e. g. basic product: 29,00 € * 15% = 4,35 €).

But when the user then changes the basic product price (e. g. by increasing the measaures of my product) the shown additional price on the images still show the value from before (e. g. basic product changed to: 49,00 € * 15% = 4,35 €).

On the other hand the calculated additional price in the products total sum correctly adepts to these changes and show the correct new vale (e. g. basic product changed to: 49,00 € * 15% = 7,35 €)

This problem can be seen on my shop for example on this page with the following product settings (sorry but the page is German language only):

https://papierwerkstatt.de/produkt/fotoalben/
Ma?e (BxH): 20x15cm
Seiten: 30 Blanko
Bezugsmaterial: Leinen

1. Hover on the first image in the field ‘Bezug Rücken’ (‘Leder – 3500-011 [+4,35 €]’).

2. Change ‘Ma?e (BxH)’ to ’30x30cm’.

3. Hover on the first image in the field “Bezug Rücken” (‘Leder – 3500-011 [+4,35 €]’)

I would be very thankful if someone might have a look at it.

The page I need help with: [log in to see the link]