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so then i go to the post, and it does not mention 0.013 anywhere on the converstation - just so where did the money come from? how did i earn it?

The earnings indicator on posts and replies only goes to 2 decimal places, so anything less than 1 cent will show as zero. When you made the reply, it likely showed nothing, but then someone else liked your reply and voted on that. When you add up all the tiny fractions of upvote cents, they show up as your pay-out after 7 days have passed.

ok, i do not fully get that, so i will take notice when i next comment on a post.

There is actually more to it than that. The numbers are only an ESTIMATE of what will be paid. When the final day comes everything is then re-calculated and the pie (the reward pool) is cut up and distributed based on the final calculation, not the estimate. I wouldn't pay too much attention to those estimates except to know very roughly what can be expected. In the end, your curation rewards are always split between SBD and Steem, so you get half to each.