I've looked for statsx.amxx fix to properly handle html tags in user names for top15 list, but nothing found.
So I decided to fix this myself.
I've modified statsx.sma in function format_top15
to replace special html chars  from < to &lt; and > to &gt;. 
like this:

    get_stats( i, izStats, izBody, t_sName, MAX_NAME_LENGTH )
    // properly handle html tags in name
    while( contain ( t_sName, "<" ) != -1 )
    	replace( t_sName, MAX_NAME_LENGTH, "<", "<" )
    while( contain ( t_sName, ">" ) != -1 )
    	replace( t_sName, MAX_NAME_LENGTH, ">", ">" )
    iLen += format( sBuffer[iLen], MAX_BUFFER_LENGTH - iLen,
                    "%2d %-22.22s %6d %6d %6d %6d %4d %3.0f%% %3.0f%%^n", i+1, t_sName,
                    izStats[STATS_KILLS], izStats[STATS_DEATHS], izStats[STATS_HITS], 
                    izStats[STATS_SHOTS], izStats[STATS_HS],
                    effec( izStats ), accuracy( izStats ) )

the question is what happened if replace function did not replace character in case of maximal name length ? then this is an endless loop isn't it ?
Can be return value of replace used in any case ?