Understanding of をだけを


In a comment on [this
question](https://japanese.stackexchange.com/questions/70597/%E3%81%A0%E3%81%91-two-
questions/70599#70599) it was pointed out that the combination "をだけ" appears a
lot in a Google search, despite my thought that it was ungrammatical. On
closer inspection it seems that many of these hits are of the form をだけを.
Here's an example:

> 体重 **をだけを** みてはいけない  
>  It's no good if you're only looking out for your weight ( _not sure about
> my translation_ )

It seems to occur far too often for this to be a typo.

What's going on here?

