STM32CubeIDE printf浮点数，浮点数丢失数值的原因？

1、芯片：STM32F103C8T62、环境：STM32CubeIDE3、问题：printf浮点数，浮点数数值丢失如 float A=25.6666；float B=24.7777；实际打印出来：第一种情况：A=2.0000；B=0.0000；第二种情况：A=-2.0000; B=-26815615859885194199148049996411692254958731641184786755447122887443528060147093953603748596333806855380063716372972101707507765623893139892867298012168192.000000偶尔会出现以上情况，除此之外正常打印浮点数。4、已开启STM32CubeIDE打印浮点数，也加了Flag。打印整数不会出现问题尝试double A；double B；也会出现上述问题以下是代码
void HAL_tiM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
double Printf_T_Set,Printf_T_Act;
Printf_T_Set = T_Set;
Printf_T_Act = T_Act;
if(htim->Instance == htim2.Instance)
{
if(printSoftwareVersion==1){    printSoftwareVersion=0;    printf("Software Version: M01_40mA_V03 rn");}if(printEnabled==1){//          printf("T-Set:%.4f rn",Printf_T_Set);
//          printf("T-Act:%.4f rn",Printf_T_Act);
    printf("T-Set:%lf rn",Printf_T_Set);    printf("T-Act:%lf rn",Printf_T_Act);}}}
ifdef GNUC

define PUTCHAR_PROTOTYPE int __io_putchar(int ch)

else

define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)

endif

PUTCHAR_PROTOTYPE
{
HAL_UART_Transmit( huart1,(uint8_t *) ch,1,0xFFFF);//阻塞方式打印,串口1
return ch;
}