Strange characters displayed when the project is generated

Dear all,

I need your help.

I'm using Robohelp to manage a big user guide for a software application.

When I generate the project, Robohelp randomly creates topics with strange/wrong characters instead of producing the real page.

This is very random because it happens very often but it never happens on the same topics.

Below, you find an example of the characters generated by Robohelp.

‰Û÷-þŸòËCÇ”Ä2» ¸qCþåA¨ñ®ú?t_ :1v!* «8"AÚ°·úûDµ¬Ë@  eP ¯S~‚zìòa  &#157;à๠ j­ ˜‰cÏ&#129;Ô óž¾ª&#129;$G N p)&#141;vG ÑcÜ ÎtI¡&#127;¨ï4ÁÓìO Hòm 5,6¦ZOÝ&#127;<�î}·²pê™zµ[Δa¯á£ÈÝ¡» ··¦žfy×øé'f &  "²šQRœ¼ &#127;õ)ÍJJµ¿8[‰ í'&#144;lkŸðA#&#144;  qhÅ`b|Íï‰Aº ÷&#127;r†š3%îÀ   )’>è¯ ,fÿ4èJ ÊäGî"œo&#157;_ áª}òчaK     P<{$!Þâs&E'Fµ½ áV ê·´sÆ@aMÊŒÓ:¨/‡¡Kúã†Ø–§>ûåuû î‚}q~ ž³N{ ('— Ñ[!f ôùBC ?¨Jz Õ² NÕy? ¡‡Š/ GÁPJs ç Ç…&#143;Õ5«ÇÐ8  …˜.ÏŒSD¥&#141;< èHD;]ëÙ-ú½{â0½¿êÖ9dϲ§&#129; &#143;¯îhjDЦ¶ EY…ã}aØàˆÒ&#141;9C&#144;3Ê 

Have you ever get such a bug?

Do you know how to deal with it?

Thanks in advance for any type of answer.