min_tariff price doesn't work properly

i have a room type with complex tariff:
type: Rate per person per stay;
mode: day;
valid from: 01-05-2018;
valid to: 30-09-2018.
i have 2 adults and 3 children prices for different ages.
on my front-end when the guest clicks "book now" button in a single room type page, it shows him incorrect price (not the minimum price for this room type).
if i have a lot of tariff for different dates, everything works fine,but if i have 1 big tarriff with different dates....

please,help me to understand, my boss is gonna kill me if i won't explain him the way this component works XDD
maybe i should open ticket, but right now the site is on my localhost.can You help me?

Hi,

Please raise a new support ticket, we are working on some improvement on this area and we will share you some patch files if necessary.

Regards,