This looks like a confusion between Unicode and ISO-8859-x.
The source file is probably UTF-8 plain text. For some reason, the uploading process thought it was ISO-8859-x and converted it to Unicode giving the surprising text.
Edit your question to explain how you uploaded the text (which intermediate steps with which applications). Mention your OS, that could help to suggest tools.
I’d like more technical details on the process of uploading.
How was the initial file content typed? Locally with a text editor (not a document processor like LO)?
Was this initial file uploaded via the Chrome browser? Or some other tool/protocol like ftp?
I guess that you had a plain text (without any formatting effect like bold or italics) file which was uploaded using an HTML tool. HTML protocol uses “headers” to describe the exchanged data. One of these headers tells the recipient the character encoding used at source. It is ISO-8859-1 by default. When source file is plain text, there is no marker inside it (*) to contradict this default. At the other end, this wrong encoding is remembered.
When file is opened by LO, the byte stream is erroneously taken for an ISO-8859-1 while it is in fact an UTF-8 stream. Your original text is probably “You’ve achieved” with a typographical apostrophe U+2019 RIGHT SINGLE QUOTATION MARK, which UTF-8 encoding is 0xE2 0x80 0x99. 0xE2 is “â” both in ISO-8859-1 and Unicode which explains the first strange character. 0x80 and 0x99 are control characters in the C1 set; they may display strangely, accounting for the other characters.
You must find a way to force the uploading mechanism to transmit the file as an UTF-8 stream. If you can’t select the encoding in the utility, try to put a “BOM” (byte order mark or ZERO WIDTH NO-BREAK SPACE) at the start of your file.
BOM is U+FEFF, but included as such in a UTF-8 stream, it may disrupt correct interpretation. Its UTF-8 encoding is 0xEF 0xBB 0xBF. This may be quite difficult to insert unless you have an hexadecimal editor.
(*) The only marker which can flag a plain text file is BOM appearing as the first character in the file.