No, it's a well known problem with all the Slingboxes (I guess you didn't do a search of the forum before posting ? there are lots of posts about it). Basically Sling decided to 'hard-wire' the IR system so it always sends 3 copies of the signal. This ensures the receiver has a good chance of picking it up. The problem, as you are finding, is that a sensitive receiver will react to 2, or even all 3 of the IR bursts, causing the double-skip.
Now, there is nothing that can be done with the built-in remotes, but if you use a Custom Remote it is sometimes possible to tweak it to set the repeat rate to zero. Before I spend time working on this can you try the Custom Remote at Pace RNG150N and see if it works ?