Unfortunately I cannot export the workflow, since it was made for navigating internal URLs of my employing organisation; however I can share a simple setup reproducing the problem.
So it happens because I'm generating the path for the page, including slash symbols, but in some cases it feels very natural to do so (check out the simple example with the Github repo URLs generation).
BTW, I tried running an automatic replacement of `skipvarencode` and `skipqueryencode` values to `true`, and it fixed my problem.
Not sure how to attach Alfred workflow file here, it seems to only allow images, so I'm sharing via Dropbox: https://www.dropbox.com/s/68nzex09ats7npb/[Example workflow] Popular Github projects.alfredworkflow?dl=0