Voiceover saying "Space" frequently in some web pages

Have someone else noticed an issue with Voiceover when visiting some pages with Safari and in the middle of a sentence Voiceover saying the word "Space" without any reason? For example I can't visit any page in Wikipedia without hearing the word "Space" several times in a paragraph. I haven't found any reason for this. If I read character by character I get the announcement for every space between words as it is expected, but in a continuous reading of the text, the word pop out without any logical reason.

Any advice will be appreciated.