The problem lies in different Word software having different algorithms to count words. For example, MS-Word in Windows would display a different count for the same piece of text compared to a similar Word software in Macintosh OS.
The solution to this problem is to set the word count limit in an excess of 10-20 words so students with higher word count in their texts could still be able to enter and save their information in the abstract submission form.
In the field's description, do mention to limit the description to 250 words.