Same copies of support gems causing unexpected immunity to elemental ailments

The 3 support gems: Cool Headed, Warm Blooded & Strong Hearted which are added in 0.2 patch has the following issues:

While you have more than one copy of the mentioned gems socketed & enabled (Using Solus Ipse or Gemling Ascendary to enable multiple copies of support gems), the ailment duration will be mistakenly reduced to 0 seconds, indicating easy immunity to ignites/shock/freeze that has finite duration.

The discription of the three gems shows that the duration modifier is defined as '50% less duration'. This should incicate that you should have 25% duration (50%*50%=25%) in total upon using two copies of these gems but not directly 0%.

Please check if this is an expected game design, or it might be a game breaker as the limitation of same copies of support gems will be removed in the next patch.