Product combinations Prestashop

When changing combinations, prices don't change automatically, F5 refresh needed. Sample:
http://wally.lt/grindjuostes/33-188-balta-arba-juoda-pusiau-matine-lygiu-pavirsiumi.html#/39-spalva-balta/49-medziaga-mdf/51-blizgumas-pusiau_matine/52-storis-12mm/54-aukstis-60mm/60-ilgis-2070mm/63-pavirsius-lygus